The element used in the manufacture of safety matches is – (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

The element used in the manufacture of safety matches is – (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur
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(1) Phosphorous Explanation: One end of a match is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. The coated end of a match, known as the match "head," contains either phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as a binder.
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The element used in the manufacture of safety matches is (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Description : The element used in the manufacture of safety matches is (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Last Answer : Phosphorous

Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of red phosphorous is due to its polymeric structure (C) Red phosphorous is the most reactive allotropic form of phosphorous (D) Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

Description : Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of ... in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

Last Answer : (C) Red phosphorous is the most reactive allotropic form of phosphorous

__________ is added in low carbon steel to raise its yield point. (A) Sulphur (B) Phosphorous (C) Silicon (D) Manganese

Description : __________ is added in low carbon steel to raise its yield point. (A) Sulphur (B) Phosphorous (C) Silicon (D) Manganese

Last Answer : (D) Manganese

Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Last Answer : (B) Silicon

Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Last Answer : Option B

The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium

Description : The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium

Last Answer : Option B

The element used for making solar cells is - (1) Magnesium (2) Sodium (3) Calcium (4) Silicon

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Last Answer : (4) Silicon Explanation: Materials presently used for photovoltaic solar cells include mono-crystalline silicon, polycrystaijhne silicon, amorphous silicon, cadmium telluride, and copper indium selenideisulfide.

What is the element that is in the highest percentage in the composition of the earth? (1) Silicon (2) Oxygen (3) Magnesium (4) Iron

Description : What is the element that is in the highest percentage in the composition of the earth? (1) Silicon (2) Oxygen (3) Magnesium (4) Iron

Last Answer : (2) Oxygen Explanation: Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of ... of it in the oceans. About a fifth of its atmosphere is made up of oxygen, produced by plants.

Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium

Description : Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium

Last Answer : ANSWER: C -- GALLIUM

The element used for making solar cells is (1) Magnesium (2) Sodium (3) Calcium (4) Silicon

Description : The element used for making solar cells is (1) Magnesium (2) Sodium (3) Calcium (4) Silicon

Last Answer : Silicon

What is the element that is in the highest percentage in the composition of the earth ? (1) Silicon (2) Oxygen (3) Magnesium (4) Iron

Description : What is the element that is in the highest percentage in the composition of the earth ? (1) Silicon (2) Oxygen (3) Magnesium (4) Iron

Last Answer : Oxygen

The element used for vulcanizing rubber is - (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Description : The element used for vulcanizing rubber is - (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Last Answer : (1) Sulphur Explanation: The vulcanization of neoprene or polychloroprene rubber (CR rubber) is carried out using metal oxides (specifically MgO and ZnO, sometimes Pb3O4) rather than sulfur compounds which are presently used with many natural and synthetic rubbers.

The element which is used for vulcanizing rubber – (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Description : The element which is used for vulcanizing rubber – (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Last Answer : (1) Sulphur Explanation: Vulcanisation is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.

The element which is used for vulcanizing rubber (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Description : The element which is used for vulcanizing rubber (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus

Last Answer : Sulphur

Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : (4) Silicon Explanation: Fertilizers typically provide, in varying proportions: (1) six macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S); and (ii) eight ... copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn) and nickel {Ni}.

Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : Silicon

The following element can't impart high strength at elevated temperature A. Manganese B. Magnesium C. Nickel D. Silicon

Description : The following element can't impart high strength at elevated temperature A. Manganese B. Magnesium C. Nickel D. Silicon

Last Answer : B. Magnesium

Which of the following statements is not valid for oxoacids of phosphorus? (1) All oxoacids contain atleast one P = O unit and one P – OH group (2) Orthophosphoric acid is used in the manufacture of triple superphosphate. (3) Hypophosphorous acid is a diprotic acid. (4) All oxoacids contain tetrahedral four coordinated phosphorous

Description : Which of the following statements is not valid for oxoacids of phosphorus? (1) All oxoacids contain atleast one P = O unit and one P – OH group (2) . (3) Hypophosphorous acid is a diprotic acid. (4) All oxoacids contain tetrahedral four coordinated phosphorous

Last Answer : Orthophosphoric acid is used in the manufacture of triple superphosphate.

Which chemical is used to ripen mangoes artificially? (1) Sulphur Dioxide (2) Nitrous Oxide (3) Calcium Carbide (4) Phosphorous

Description : Which chemical is used to ripen mangoes artificially? (1) Sulphur Dioxide (2) Nitrous Oxide (3) Calcium Carbide (4) Phosphorous

Last Answer : (3) Calcium Carbide Explanation: The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.

Which one of the following nonmetals shows allotropy in the liguid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Description : Which one of the following nonmetals shows allotropy in the liguid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Last Answer : (2) Sulphur Explanation: Sulphur is a non-metal that shows allotropy in the liquid state. If sulphur is heated slowly the changes between the different forms can be observed. These changes are in the ... of cold water, plastic sulphur is formed. This is an elastic, rubber-like form of sulphur.

Which one of the following nonmetals shows allotropy in the liquid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Description : Which one of the following nonmetals shows allotropy in the liquid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Last Answer : Sulphur

Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these

Description : Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these

Last Answer : oxides of nitrogen and sulphur

The three elements most needed in common fertilisers are : (1) Sulphur, Phosphorous and Sodium (2) Nitrogen, Potassium and Phosphorous (3) Phosphorous, Sodium and Nitrogen (4) Calcium, Phosphorous and Potassium

Description : The three elements most needed in common fertilisers are : (1) Sulphur, Phosphorous and Sodium (2) Nitrogen, Potassium and Phosphorous (3) Phosphorous, Sodium and Nitrogen (4) Calcium, Phosphorous and Potassium

Last Answer : Nitrogen, Potassium and Phosphorous

Which of the following is used in pencils? A.Graphite B.Silicon C.Charcoal D.Phosphorous -Science

Description : Which of the following is used in pencils? A.Graphite B.Silicon C.Charcoal D.Phosphorous -Science

Last Answer : answer is A. Graphite

Which of the following exercises most powerful influence on the mechanical properties of steel? (A) Manganese (B) Carbon (C) Phosphorous (D) Silicon

Description : Which of the following exercises most powerful influence on the mechanical properties of steel? (A) Manganese (B) Carbon (C) Phosphorous (D) Silicon

Last Answer : (B) Carbon

Bearings subjected to light load are made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Silicon bronze

Description : Bearings subjected to light load are made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Silicon bronze

Last Answer : (B) Phosphorous bronze

Which of the following is used in Pencils? A. Graphite (Answer) B. Silicon C. Charcoal D. Phosphorous

Description : Which of the following is used in Pencils? A. Graphite (Answer) B. Silicon C. Charcoal D. Phosphorous

Last Answer : A. Graphite (Answer)

Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Description : Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Last Answer : Option D

Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of (A) Phosphoric acid (B) Superphosphate (C) Phosphorous (D) Triple superphosphate

Description : Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of (A) Phosphoric acid (B) Superphosphate (C) Phosphorous (D) Triple superphosphate

Last Answer : (C) Phosphorous

Phosphate rock is a raw material for the manufacture of (A) Phosphoric acid (B) Phosphorous (C) Superphosphates (D) All (A), (B) and (C)

Description : Phosphate rock is a raw material for the manufacture of (A) Phosphoric acid (B) Phosphorous (C) Superphosphates (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Identify and manufacture the phosphorous required for match box sticks.

Description : Identify and manufacture the phosphorous required for match box sticks. 

Last Answer : Red phosphorus is used in production of match boxes. Red Phosphorous Production Raw material: Phosphate rock, coke, sand Reaction: Phosphate rock is ground, mixed with portion ... when approximately 70% has been converted. Heat control is required as reaction is exothermic.   

Psychotic symptoms and parkinsonism like symptoms develop due to inhalation poisoning of (A) Manganese (B) Phosphorous (C) Magnesium (D) Zinc

Description : Psychotic symptoms and parkinsonism like symptoms develop due to inhalation poisoning of (A) Manganese (B) Phosphorous (C) Magnesium (D) Zinc

Last Answer : Answer : A

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron. (A) Manganese (B) Phosphorous (C) Magnesium (D) Chromium

Description : Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron. (A) Manganese (B) Phosphorous (C) Magnesium (D) Chromium

Last Answer : Option C

Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Description : Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Last Answer : (3) Chlorine Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15.

Which of the 3rd period elements loses electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Silicon

Description : Which of the 3rd period elements loses electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Silicon

Last Answer : ANSWER: A-SODIUM

Which of the following correctly matches an organelle with its function? (A) Mitochondrion . . . photosynthesis (B) Nucleus . . . cellular respiration (C) Ribosome . . . manufacture of lipids (D) Central vacuole . . . storage

Description : Which of the following correctly matches an organelle with its function? (A) Mitochondrion . . . photosynthesis (B) Nucleus . . . cellular respiration (C) Ribosome . . . manufacture of lipids (D) Central vacuole . . . storage

Last Answer : (D) Central vacuole . . . storage

High amount of sulphur and phosphorous in coke causes (A) Decrease in its calorific value (B) Increase in its strength(C) Brittleness of steel made by using it(D) None of these

Description : High amount of sulphur and phosphorous in coke causes (A) Decrease in its calorific value (B) Increase in its strength (C) Brittleness of steel made by using it (D) None of these

Last Answer : (C) Brittleness of steel made by using it

A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength

Description : A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength

Last Answer : (A) Sulphur & phosphorous content

Which of the following does not come under the category of ‘primary nutrient' for plant growth? (A) Potassium (B) Nitrogen (C) Phosphorous (D) Sulphur

Description : Which of the following does not come under the category of ‘primary nutrient' for plant growth? (A) Potassium (B) Nitrogen (C) Phosphorous (D) Sulphur

Last Answer : (D) Sulphur

Which of the following is not a measure component necessarily to be present in fertilisers? (A) Nitrogen (B) Potassium (C) Phosphorous (D) Sulphur

Description : Which of the following is not a measure component necessarily to be present in fertilisers? (A) Nitrogen (B) Potassium (C) Phosphorous (D) Sulphur

Last Answer : (D) Sulphur

________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant. (A) Calcium (B) Fluorine (C) Phosphorous (D) Sulphur

Description : ________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant. (A) Calcium (B) Fluorine (C) Phosphorous (D) Sulphur

Last Answer : (B) Fluorine

The non-metal used in batteries is a) phosphorous b)nitrogen c) carbon d)sulphur

Description : The non-metal used in batteries is a) phosphorous b)nitrogen c) carbon d)sulphur

Last Answer : c) carbon

Which of the following non-metal reacts and catches fire on exposure to air? a) phosphorous b)nitrogen c)sulphur d)hydrogen

Description : Which of the following non-metal reacts and catches fire on exposure to air? a) phosphorous b)nitrogen c)sulphur d)hydrogen

Last Answer : a) phosphorous

In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Description : In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Last Answer : (2) Sulphur Explanation: Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur, which results in three-dimensional crosslinking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.

In vulcanisation process, rubber can be hardened by adding - (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Description : In vulcanisation process, rubber can be hardened by adding - (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Last Answer : (3) Sulphur Explanation: In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength.

In vulcanisation process, rubber can be hardened by adding (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Description : In vulcanisation process, rubber can be hardened by adding (1) Nitrogen (2) Silicon (3) Sulphur (4) Alcohol

Last Answer : Sulphur

The major use of sulphur is in the manufacture of – (1) H2SO4 (2) H2S (3) SO2 (4) Fungicide

Description : The major use of sulphur is in the manufacture of – (1) H2SO4 (2) H2S (3) SO2 (4) Fungicide

Last Answer : (1) H2SO4 Explanation: The major use of sulphur is in the manufacture of sulphuric acid (H2SO4) which is one of the most important compounds made by the chemical industry. It is used to make, literally, hundreds of compounds needed by almost every industry.

Raw materials used for the manufacture of glass are – (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda

Description : Raw materials used for the manufacture of glass are – (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda

Last Answer : (1) sand, soda, limestone Explanation: Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special ... over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.

Raw materials used for the manufacture of glass are (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda

Description : Raw materials used for the manufacture of glass are (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda 

Last Answer : sand, soda, limestone

Which form of phosphorus is used in safety matches?

Description : Which form of phosphorus is used in safety matches?

Last Answer : Red phosphorus